Abstract
This article focuses on a recent concept of covariation for processes taking values in a separable Banach space \(B\) and a corresponding quadratic variation. The latter is more general than the classical one of Métivier and Pellaumail. Those notions are associated with some subspace \(\chi \) of the dual of the projective tensor product of \(B\) with itself. We also introduce the notion of a convolution type process, which is a natural generalization of the Itô process and the concept of \(\bar{\nu }_0\)-semimartingale, which is a natural extension of the classical notion of semimartingale. The framework is the stochastic calculus via regularization in Banach spaces. Two main applications are mentioned: one related to Clark–Ocone formula for finite quadratic variation processes; the second one concerns the probabilistic representation of a Hilbert valued partial differential equation of Kolmogorov type.
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Acknowledgments
The research was supported by the ANR Project MASTERIE 2010 BLAN-0121-01. The second named author was partially supported by the Post-Doc Research Grant of Unicredit & Universities and his research has been developed in the framework of the center of excellence LABEX MME-DII (ANR-11-LABX-0023-01). The authors are grateful to two anonymous Referees for reading carefully the paper and helping us in improving its quality.
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Di Girolami, C., Fabbri, G. & Russo, F. The covariation for Banach space valued processes and applications. Metrika 77, 51–104 (2014). https://doi.org/10.1007/s00184-013-0472-6
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DOI: https://doi.org/10.1007/s00184-013-0472-6
Keywords
- Calculus via regularization
- Infinite dimensional analysis
- Clark–Ocone formula
- Itô formula
- Quadratic variation
- Stochastic partial differential equations
- Kolmogorov equation